Method of and apparatus for making spline-carrying machine elements



Patented Mar. 9, 1920.

A. 1. FISHER. METHOD 0F AND APPARATUS FOR MAKING SPLINE CARRYING MACHINE ELEMENTS.

APPLICATION FILED DEC. 23, I9I8.

UNITED sTATEs PATENT OEEICE.

ALVA J. FISHER, OF EVANSTON, ILLINOIS, Ass'IGNoR TO'HURLEY MACHINE COMPANY,

. or CHICAGO, ILLINOIS, A CORPORATION OE ILLINOIS.

METHOD or AND APPARATUS FOR MAKING sI LI1`vECARRYINer` MACHINE ELEMENTS.l

To all whom t may concern.'

Be it known that I, ALvA J. FISHER, a citizen of the United States, residing at Evanston, in the county of Cook and State of Illinois, havel invented certain new and useful Improvements in Methods of and Apparatus for Making Spline-Carrying Machine Elements, of which the following is aspeciiication. j

My invention relates to making a splinecarrying machine element, and provides a method and means for its production.

Machine elements that are to be splined to vshafts are usually made of steel, machined to provide the vshaft receptive hole and the spllne slot, and into said slot 'the' separatelymade spline must be accurately fitted, either With a drive fit Or with provision'for rivetretention. Inherently 'these elements are yrelatively expensive,'evenin quantity production. Generically such splined elements must be accurate in shaft-hole size and centering, inthe location, extent of projection and size of the spline,'and in firm anchorage rof the spline in the element-body. 0f course these machine-elements `may take an unlimited number of external forms, sizes, and designs, and in a great number `of instances the element to be produced is of a character that might Well have itsl body made of cast metal ifr the requirements as lto the shaft-hole and the spline can be vmet in the cast article.

My invention is intended to provide for the making of an inexpensive, satisfactory spline-carrying machine-element having its body mainlya casting, providing a satisfactory and adequate method and meansjfor the production of such article, and in general my invention consists inthe features hereinafter set forth andclaimed pertaining production of such articles` c Y' As a single instance, for purposes of disclosure,I have Vselected a splined clutch-ele- Vment `as the 'subject of illustrati-on, (but without intent, of course, to limit my invention in its broaderaspects to such specific article), and in the drawings, Figure 1 is a perspective view, with parts broken away,

'showing Athe vsplined clutch element with Ya cast-metal body; Fig L 2 is an elevation, with parts in section, of acore" element suitable to be employed" inthe manufacture'of Athe specific clutch member; `Fig.'3 is a pen` Specification of Letters Patent.

. Patented Mar. 9, 1920.

Application led December 2.3, 1918. Serial No. 267,991.

spective detail of a sleeve; Fig. L1V is a per- Fig. 5 is a sectional view of a mold with an embedded pattern, and Fig. 6 is a similar section of the mold with the core, sleeve, and spline emplaced therein.

In detail the particularelement illustratedvin Fig. 1 is a clutch member 10 adapted for sliding fit with la grooved shaft, and the body 11 `of the member vis shown vas' a casting shaped to provide end heads 12 and an intervening reduced waistv13, each `head havingcrownteeth or projections 14.A They shaft hole 15 extends axially through the body and is faced with a liner 16, pre` formed to its cylindrical contour of specified core element 22 congruent, in part, with the pattern vand designed for coperatio'n with Athe sleeve 16 and spline 18 during the'casting operation. This core element is so con- 1 structed that it` may` be `removed subsequently to the completion ofthe casting. Pattern 21, from its middle to `the imaginary lines X, X (Fig.` 5) is externally shaped to give the sand-cavity proper form for shaping the casting-body, and beyond said linesit preferably provides axial guide extensions 23.` The core-element 22V has 4heads 241V and 24 preferably of metal to constitute chill blocks, and these heads, corresponding in shape with zones 23 of the pattern, t in the guide extensions olf the cavity, as 'shown in Fig. 6. yIn the simple element shown these two heads may be duplicates in external shape, and provided with confronting recesses 25 to give form tothe Lclutch 'teeth 1li` 'of the machine-element. One head 2i'is axially removable from the core stem "26 that connects them, such head` fitting snugly on a reduced stem-extension 27 in the end of which there is a chord-notch 28 vto'eIngage a transverse pin 29 insuring that the removable head always'goe's on the coretive slot, a slotted liner interitting with said core, and a pre-formed spline inserted through said liner slot into the core slot and having portions protruding beyond said liner7 whereby a body may be cast around said core-carried liner and spline and these removed from the core when the latter is separated.

6. In combination, a mold affording a metal-receptive spaceJ a core in the mold having a spline-receptive space, a slotted liner surrounding the core, a spline inserted through the liner slot into said core-space and protruding into metal-receptive space of the mold, whereby a body may be cast around the liner and spline and these re# moved from the mold and core.

7. In Combination, a mold having a metal receptive cavity and extensions, a core having a slotted stem and heads that fit in said mold cavity extensions, said core being separable to permit of removal of parts encompassing said stenna slotted liner on the stenna pre-formed spline extending through said liner and into the stein-slot and having 'portions protrudinginto the mold-cavity, whereby a body may lbe cast around said liner, the body and Core removed and the eore` removed from the united body, liner and spline.V

- 8. In vcombina-tionJ a mold, means to support a slotted liner therein, and a spline extending through the liner-slot and projecting on both sides thereof, whereby a body.

may be cast around the liner and spline, to permanently unite the body, spl1ne and hner into Va spline-Carrying machine-element.

ALVA J. FISHER. 

